25mm Galvanised Steel Single Gang Back BoxQTY = 5Also sold singularly.Overview - Back boxes are used behind face plates, they allow the face plate to be screwed and secured flush to a wall. The back box itself should be screwed into position. Common face plates which may be used with a back box are light switches, plug sockets, modular systems, etc. Different face plates require different depth back boxes, we stock a full selection. Technical SpecStandard UK sized back boxBrass Earth TerminalsDimensions - 72mm (W) x 72mm (H) x 25mm (D)Standards - ROHS, BS4662.